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(n)(n-1)(n-2)=720
We move all terms to the left:
(n)(n-1)(n-2)-(720)=0
We multiply parentheses ..
n(+n^2-2n-1n+2)-720=0
We multiply parentheses
n^3-2n^2-1n^2+2n-720=0
We do not support enpression: n^3
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